SM802105 Datasheet, PDF (6/11 Pages) Micrel Semiconductor – ClockWork 10GbE (156.25MHz, 312.5MHz), Ultra-Low Jitter, LVPECL Frequency Synthesizer

Micrel, Inc.
SM802105
AC Electrical Characteristics^{(4, 5)}
V_DD = V_DDO1/2 = 3.3V ±5% or 2.5V ±5%
V_DD = 3.3V ±5%, V_DDO1/2 = 3.3V ±5% or 2.5V ±5%
T_A = −40°C to +85°C. R_L = 50Ω to V_DDO − 2V
Symbol
Parameter
Condition
F_OUT1
F_OUT2
Ppm
Output Frequency 1
Output Frequency 2
Output ppm Variation
FSEL=1
FSEL=0
Crystal reference. Note 6
F_REF
T_R/T_F
ODC
Reference Input Frequency
LVPECL Output Rise/Fall Time
Output Duty Cycle
20% – 80%
T_SKEW
T_LOCK
Output-to-Output Skew
PLL Lock Time
Within bank. Note 7
156.25MHz
Integration Range (1.875MHz – 20MHz)
Integration Range (12kHz – 20MHz)
T_jit(∅)
RMS Phase Jitter⁽⁸⁾
312.5MHz
Integration Range (1.875MHz – 20MHz)
Integration Range (12kHz – 20MHz)
Min.
−50
80
48
Typ.
156.25
312.5
25
175
50
Max.
50
350
52
45
20
110
250
110
250
Units
MHz
MHz
ppm
MHz
ps
%
ps
ms
fs
Spurious Noise Components
6.25MHz using 156.25MHz
12.5MHz using 312.5MHz
-80
dBc
-85
Notes:
5. All phase noise measurements were taken with an Agilent 5052B phase noise system.
6. Crystal tolerance at room less than ± 15ppm, over temp less than ±20ppm.
7. Defined as skew between outputs at the same supply voltage and with equal load conditions and same frequency; Measured at the output
differential crossing points.
8. Measured using 25MHz crystal as the input reference source. If using an external reference input, use a low phase noise source. With an external
reference, the phase noise will follow the input source phase noise up to about 1MHz.
April 2011
6
M9999-042111-A
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